@article {2003,
	title = {The calibration method for the Mumford-Shah functional and free-discontinuity problems},
	journal = {Calc. Var. Partial Differential Equations 16 (2003) 299-333},
	number = {SISSA;35/2001/M},
	year = {2003},
	publisher = {Springer},
	abstract = {We present a minimality criterion for the Mumford-Shah functional, and more generally for non convex variational integrals on SBV which couple a surface and a bulk term. This method provides short and easy proofs for several minimality results.},
	doi = {10.1007/s005260100152},
	url = {http://hdl.handle.net/1963/3051},
	author = {Giovanni Alberti and Guy Bouchitte and Gianni Dal Maso}
}
